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A method for controlling the shape of hot-rolled strip with micro-medium waves

A hot-rolled strip steel and control method technology, applied in the direction of contour control, etc., can solve problems such as residues, affecting hot-rolled production, and affecting the processing and use of downstream users, so as to improve the problem of strip shape scratches, improve strip shape quality, Effect of improving shape defects

Active Publication Date: 2016-08-24
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the shape defects of strip steel products affect the hot rolling production, which is likely to cause rolling instability, scrap steel, coil misalignment, etc., and on the other hand, affect the processing and use of downstream users
[0008] For thin and wide-sized products, since the double-sided waves are limited to a certain range on the side, when this micro-medium wave rolling method is adopted, the edge waves of the final product may not be well eliminated or the middle waves may remain, and even edge-center compounding may occur. Therefore, it is impossible to fundamentally improve the shape quality of the product

Method used

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  • A method for controlling the shape of hot-rolled strip with micro-medium waves
  • A method for controlling the shape of hot-rolled strip with micro-medium waves
  • A method for controlling the shape of hot-rolled strip with micro-medium waves

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] For a hot-rolled strip product, the size is 2.3×1250mm, and the target micro-wave control amount is 0.6%. In production, according to the method in this paper, when there is a certain deviation between the measured micro-wave value and the target value, it is controlled by adjusting the bending force of F2~F4, so that the measured micro-wave value can reach the target value. The control parameter related to the bending force is α 2 =0.015,α 3 =0.041,α 4 =0.072. The shape control before and after the implementation of this method is shown in Table 1.

[0052] Table 1 Shape control under the old method and the new method

[0053] Test times

Embodiment 2

[0055] For a hot-rolled strip product, the size is 3.0×1250mm, and the target micro-wave control amount is 0.8%. In production, according to the method in this paper, when there is a certain deviation between the measured micro-wave value and the target value, it is controlled by adjusting the bending force of F2~F4, so that the measured micro-wave value can reach the target value. The control parameter related to the bending force is α 2 =0.017,α 3 =0.049,α 4 =0.087. The shape control before and after the implementation of this method is shown in Table 2 below.

[0056] Table 2 Shape control under the old method and the new method

[0057] Test times

Embodiment 3

[0059] For a hot-rolled strip product, the specification is 4.0×1460mm, and the target micro-wave control amount is 1.1%. In production, according to the method in this paper, when there is a certain deviation between the measured micro-wave value and the target value, it is controlled by adjusting the bending force of F2~F4, so that the measured micro-wave value can reach the target value. The control parameter related to the bending force is α 2 =0.022,α 3 = 0.050, α 4 =0.093. The shape control before and after the method is implemented is shown in Table 3 below.

[0060] Table 3 Shape control under the old method and the new method

[0061] Test times

Number of rolls produced

Number of bad rolls

Non-performing rate

Before implementation

47

16

34.0％

After implementation

61

4

6.6％

[0062] The content to be protected by the present invention is as follows:

[0063] (1) The hot-rolled strip micro-wave rolling me...

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Abstract

The invention relates to a slight center wave strip-shape control method of hot-rolled strip steel. The method comprises the following steps: firstly, choosing a strip-shape feedback control frame; utilizing the adjusting manner of upstream frames, namely, adjusting the roll bending forces of the frames F2-F4 to realize the targeted slight center waves at a precision rolled outlet; secondly, controlling and adjusting the roll bending forces; detecting the flatness of the strip steel in real time by a strip-shape instrument and comparing it with a target value; if the deviation exists, adjusting the roll bending forces of the frames F2-F4. The slight center wave strip-shape control method of hot-rolled strip steel is applicable to overcoming strip-shape problems caused by the stages such as cooling and thermal treatment after hot rolling; the strip-shape quality of martensitic stainless steel strips is improved greatly and the scratching on the surface strip-shape in follow-up pickling and continuous annealing production is solved.

Description

technical field [0001] The invention relates to the field of hot-rolled strip steel production, and in particular, to a method for controlling the shape of a hot-rolled strip with micro-medium wave shape, which is suitable for the shape quality control of hot-rolled strip steel products. Background technique [0002] Flatness is an important quality indicator of hot-rolled strip products. The external appearance of poor plate shape is the wave or buckling of the strip, and the internal manifestation is the uneven distribution of the internal residual stress, which is caused by the uneven plastic deformation, phase transformation or temperature distribution along the width, length or thickness of the strip. Wait. On the one hand, the shape defects of strip steel products affect the hot rolling production, and it is easy to cause unstable rolling, scrap, coiling dislocation, etc., on the other hand, it affects the processing and use of downstream users. Due to the numerous i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/28
CPCB21B37/28
Inventor 张国民焦四海杨宴宾
Owner BAOSHAN IRON & STEEL CO LTD
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